body{
    font-size: 20px;
    font-family: "微软雅黑";
    color:blue;

}
.box1{
    width: 200px;
    height:100px;
    border: 1px solid #000;
    padding: 5px;
    position:relative;
}
.box2{
    widows: 40%;
    height: 40%;
    background-color: #999;
    margin; 10%
    color: red;
}
#box21{
    position: absolute;
    top:-10px;
    left:10px;
}
#box22{
    position: fixed;
    bottom: 10px
    right: 50px
}